Update: One of crashed EgyptAir Flight MS804 black boxes repaired

One of the black boxes from EgyptAir Flight MS804 has been repaired, after Egyptian investigators sent two recovered black boxes from the crashed flight to French investigators Monday, the British Guardian newspaper reported.

The repaired black box will be sent back to Cairo for analysis. The other black box, containing voice recordings from the cockpit, suffered severe water damage and is still to be repaired.

It is hoped the black boxes will shed light on what led to the fatal crash in the Mediterranean Sea on May 19, which resulted in the deaths of all 66 people on board.

A legal investigation has now been opened into the crash, the office of the Paris district prosecutor told Reuters on Monday. The charges include involuntarily manslaughter, which generally implies that there was no criminal intent to down the airplane.

The prosecutor’s office added that it is not investigating the case as a terrorist act.

An international team of investigators located the black boxes on the eastern Mediterranean seabed on June 16 and 17. The memory units were first sent to Egyptian authorities and prosecutors in Alexandria before they were shipped to France for the removal of salt accumulation and repairs, Reuters said.

Following the repairs, the memory units will be returned to Egypt, where specialists are to conduct data analysis at the Ministry of Civil Aviation’s labs, according to a statement issued by the ministry last week.

It may take several weeks to analyze the data from the cockpit voice recorder and the flight data recorder, the ministry said.

Flight MS804 was en route from the Charles de Gaulle Airport in Paris to Cairo International Airport when the plane disappeared from Egyptian and Greek radar screens. There is currently little verified information into the causes of the crash, although smoke was reportedly detected in one of the lavatories near the cockpit before it plunged into the Mediterranean. Aviation authorities said the plane did not emit any distress signals.

Among the 66 individuals aboard the downed vessel, 30 were reportedly Egyptians, while another 15 were French nationals.